win32.suspend hanging and timing out on GA CI

Happened on a master run: https://github.com/DynamoRIO/dynamorio/runs/1833435385?check_suite_focus=true

 85/257 Test  #37: code_api|win32.suspend .......................................***Failed  Required regular expression not found. Regex=[^starting thread\.\.\.suspended\(count = 0\)\.\.\.resuming\.\.\.exiting thread\.\.\.resumed\(count = 1\)
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suspended\(count = 1\)\.\.\.resumed,exiting
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Testing exiting with self suspended thread\.
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done
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$
] 90.03 sec
starting thread...suspended(count = 0)...resuming...exiting thread...resumed(count = 1)